Electrically-heated radiator



Y 4(No Model.)

W. MITCHELL. ELEGTRIGALLY HBATED RADIATOR.

No. 494,301. Patented Mar. 28, 1893.

a UNITED STATES PATENT OFFICE.

WILLIS MITCHELL, OF MALDEN, ASSIGNOR TO THE BUTTERFIELD-MITCHELL ELECTRIC HEATING COMPANY, OF BOSTON, MASSACHUSETTS.

ELECTRICALLY-H EATED RADIATOR.

SPECIFICATION forming part of Letters Patent No. 494,301, dated March 28, 1893.

Application iiled June 8, 1892.

T all whom t may concern.-

Be it known that I, WILLIS MITCHELL, a citizen of the United States, residing at Malden, in the county of Middlesex and State of Massachusetts, have invented cert-ain new and useful Improvements in Electrical Radiators and Heaters; and I do hereby declare the following to be a full, clear, and Vexact description of the invention,such as Will enable others skilled in the art to which it appertains to make and use the same.

The chief object of this invention is to provide a radiator with means for heating it from Within by electricity and to adapt it to allow the passage of a currentof heated air through its front plate in order that the room may be heated by this current as well as by radiation.

To this end my invention consists in a radizo ator having electric heating devices inclosed therein; also more specifically in a radiator front-plate having inwardly extending cores and electrical heating devices mounted on the said cores; also in a radiator thus constructed and having openings in the front plate and some other part of its casing or shell forthe passage of a current of air; also in a radiator thus constructed, having the cores made tubular and concentric with the openings of the said front plate, they being in- Ward continnationsthereof; also in a radiator having openings in its front plate and its base for the passage of a current of air through it, and in other features hereinafter set forth and claimed.

In the accompanying drawings, Figure l represents a perspective view of a radiator embodying my invention. Fig.2 represents a vertical central section of the same from front to rear; and Fig. 3 represents a longitudinal section of one of the preferred heaters; although other forms may be employed.

A designates the base of the radiator to which are fastened by screws a through its raised lugs a, the vertical front plate B and the vertical rear plate C, these two plates being likewise fastened together at the top by screws a2 and wherever else fastening may be needed. To allow this at the top, the said Serial No. 435,930. (No model.)

rear plate is provided with a flange c which 5o is overlapped by the bent upper edge of the front plate,these two parts being screw-tapped accordingly. Openings D are made at intervals in series through the said front plate to the hollowinteriorof theradiator; and atubular core integral with the said front plate extends inward from the edge of each opening, being concentric therewith. In the base A similar openings F are made and the draft 0f air is from these up through the interior 6o of the radiator to the front openings D. This draft is caused, and the escaping jets of air,

as well as the plates ofthe radiator, are heated,

by a series of electrical heaters G each of which is fitted on one of the said tubular cores. By preference each of these heaters consists of a concentric set of asbestus cylinders or layers h, on which from end to end a wire or other conductor H is wound, taking the said layers successively. These cylinders 7o and the wire are covered by a sheet metal cap h. The heaters thus constructed Inay be connected in series or as desired; but the wire of each heater forms part of an electric circuit. Any other form of heating device operated by electricity may be substituted, if suited to this use; for example a wire coated with insulating material and passing from core to core being wound in helices on each. Every tubular core serves both as an outlet 8o for air and with the heater on it as a means of heating the said front plate. Of cou rse the radiation of heat from the said front plate warms the air of the apartment or hall in the usual manner; but the streams of hot air continually issuing through the said cores warm it ina dierent manner by mingling therewith. Thus there is a double action of the device which is available for other purposes than those to which a radiator technically so 9o called is applied.

The rear plate C reflects the heat of the devices G against the front plate and thereby intensifies theheating of the latter. The concentric arrangement of the cores with respect to the openin gs D makes the draft through the latter much more direct and efficient, and insures the heating of the air which thus passes.

Having thns described my invention, what inner ends andy hheaterslapplied to said cores for the'purpose set forth.

3. A radiator provided with internally extending cores, in combination with electrical heaters applied to the said cores, each heater con sistingof successive helicoidal coils of Wire in electric circuit` and interposed cylindrical partitions substantially as set forth.

In testimony whereof I attix my signature in presence ot two Witnesses.

WILLIS MITCHELL.

Vitnesses:

EDWIN W. PIERCE, PELATIAH R. TRIPP. 

